Hi all,
I am trying to update the Apache Syncope codebase (master branch, version 
2.1.0-SNAPSHOT) to Wicket 8.0.0-M7 (from Wicket 7.8.0).

After some changes, the code now builds fine, but when accessing the HomePage, 
I receive the following exception:

java.lang.NoSuchMethodError: 
org.apache.wicket.core.request.mapper.AbstractBookmarkableMapper.resolveLocale()Ljava/util/Locale;
        at 
org.apache.wicket.core.request.mapper.AbstractBookmarkableMapper.newPageParameters(AbstractBookmarkableMapper.java:488)
        at 
org.apache.wicket.core.request.mapper.MountedMapper.parseRequest(MountedMapper.java:133)
        at 
org.apache.wicket.core.request.mapper.HomePageMapper.parseRequest(HomePageMapper.java:85)
        at 
org.apache.wicket.core.request.mapper.AbstractBookmarkableMapper.mapRequest(AbstractBookmarkableMapper.java:322)
        at 
org.apache.wicket.request.mapper.CompoundRequestMapper.mapRequest(CompoundRequestMapper.java:147)
        at 
org.apache.wicket.request.cycle.RequestCycle.resolveRequestHandler(RequestCycle.java:193)
        at 
org.apache.wicket.request.cycle.RequestCycle.processRequest(RequestCycle.java:243)
        at 
org.apache.wicket.request.cycle.RequestCycle.processRequestAndDetach(RequestCycle.java:221)
        at 
org.apache.wicket.protocol.ws.AbstractUpgradeFilter.processRequestCycle(AbstractUpgradeFilter.java:70)
        at 
org.apache.wicket.protocol.http.WicketFilter.processRequest(WicketFilter.java:204)
        at 
org.apache.wicket.protocol.http.WicketFilter.doFilter(WicketFilter.java:286)
        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        at 
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198)
        at 
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
        at 
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:478)
        at 
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)
        at 
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:80)
        at 
org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:650)
        at 
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
        at 
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342)
        at 
org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:799)
        at 
org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
        at 
org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868)
        at 
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1457)
        at 
org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at 
org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
        at java.lang.Thread.run(Thread.java:748)

Since no org.apache.syncope.* classes are referenced, it is not immediate to me 
to see where is the problem: could you please help? Thanks!

Side question: any plan to remove commons-collections4 as dependency, since 
Wicket 8 is based on Java 8 where streams and lambda can be empowered for such 
purpose?

Regards.

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